board of elections officials said if the storm knocks out power, backup generators would be used to pouber machines that empower the people. >> i don't care how long the line is. we're here. we're going to vote. >> reporter: derrick ward, news 4. >>> lines were long in maryland today, too. hundreds lined up at the sports and learning complex in prince georges county. a similar situation in oxon hill, maryland, where lines wrap around the public library. some people say they waited for as long as four hours to cast their ballot. most people that we talked to said they expected to wait several hours to vote. they didn't mind. >>> both presidential campaigns are cancelling events to make sure that emergency responders can deal with sandy. mitt romney cancelled all of his sunday campaign stops in virginia. he's going to ohio instead. president obama hasn't scratched any events yet, but air force one is changing its flight schedule, and vice president biden cancelled a sunday stop in virginia beach. >>> still ahead tonight, a silent salute for a police officer killed in prince georges county. >